| Study on soil water dynamics evolvement law under straw mulching condition |
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| DOI：10.7606/j.issn.1000-7601.2009.04.15 |
| Key Words: straw mulching soil water dynamics system difference evolvement law |
| Author Name | Affiliation | | WU Qinghua | Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, Hebei 050061, China | | ZHANG Wei | Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, Hebei 050061, China | | LIN Wenjing | Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, Hebei 050061, China | | WANG Guiling | Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang, Hebei 050061, China |
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| Abstract: |
| A field test was conducted in Luancheng County of Hebei Province to study the effect of corn straw mulching on soil water dynamics. It showed that in the dry period (the last ten-day of Aug. to the last ten-day of Apr. next year) and shallow soil profile (0～70 cm), soil water dynamics was remarkably impacted by straw mulching. In dry period soil volume water and soil water potential in straw mulching experiment were higher than the control. With the soil depth increasing, the effect of straw mulching became smaller and smaller. The straw mulching made a very light impact on soil water dynamics in the depth of 180 cm. When evaporation was mainly in bare land, the amount of evaporation in the straw mulching test was 26.7 mm less than the control, which showed that straw mulching could prevent soil water from transporting to air, while the amount of evaporation in straw mulching test, in which transpiration was the primary way of water loss, was 3.3 mm more than the control, which revealed that straw mulching made a very light impact on evaporation. In dry period, the infiltration velocity of straw mulching test and the control was 0.092 mm/d and 0.115 mm/d, showing straw mulching was not in favor for soil water penetrating in the depth over 220 cm, while in wet period the infiltration velocity of straw mulching test was bigger than the control, being 0.192 mm/d and 0.096 mm/d, respectively. |
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